| 摘要 |
PURPOSE:To classify spectral energy distribution of X-ray emitted from an X-ray tube by measuring two or more transmittances of specimens which are made of uniform material and have different thicknesses and different energy distributions with regard to the X-ray. CONSTITUTION:The intensity of the X-ray irradiated from an X-ray tube 3 is measured by a first X-ray sensor 4, and constant intensity is obtained. The X-ray is transmitted through a compensating material layer 5 and a subject 6 comprising a uniform material and having different thicknesses, and inputted in an X-ray sensor 7. Its output is stored in a memory unit 10 via an AD converter 8 and an electronic computer 9. At the same time, the index number (applied voltage, a filter, and the like) corresponding to the spectral energy distribution of the X-ray is stored and displayed on a display 12. The similar measurement is performed on the X-ray having different spectral energy distribution. In this constitution, the spectral energy distribution generated in the X-ray tube 3 can be accurately classified. |
